Question

Describe what the following line of code (in relation to functions) does:

var calculatorOn = false;

function pressPowerButton() {
if (calculatorOn) {
('Calculator turning off.');
calculatorOn = false;
} else {
('Calculator turning on.');
calculatorOn = true;
}
}

pressPowerButton();
// Output: Calculator turning on.

pressPowerButton();
// Output: Calculator turning off.

Answer 1

The line of code initializes a variable to track the state of the calculator. The function checks the value of the variable and performs actions accordingly. The code demonstrates how the calculator can be turned on and off.

Step-by-step explanation:

The line of code var calculatorOn = false; initializes a variable named calculatorOn and assigns the value false to it. This variable will be used to track the state of the calculator, whether it is on or off.

The function pressPowerButton() checks the value of calculatorOn. If it is true, it outputs the message 'Calculator turning off.' and sets calculatorOn to false. If it is false, it outputs the message 'Calculator turning on.' and sets calculatorOn to true.

The pressPowerButton() function is called twice, resulting in the output 'Calculator turning on.' and then 'Calculator turning off.' indicating the calculator being switched on and off.